Double-layer catheter end rolling forming device and use method thereof

Abstract

The present invention discloses a double-layer catheter end roll forming device and a method for using the same, and relates to the technical field of roll forming equipment. The roll forming device comprises an inner retainer, an inner core shaft, an inner roller, an outer retainer, an outer roller, an outer core shaft, an inner core shaft clamping handle and a gear. One end of the inner core shaft clamping handle is fixed to the inner core shaft; the other end is used to connect a power mechanism I; one end of the inner retainer and the outer retainer is fixed by an end connecting cover and a locking component I; the other end is used to place a sleeve and a double-layer catheter, one end of the outer retainer contacts the outer core shaft through an outer roller, and the outer core shaft is connected to a power mechanism II after being fixed to the gear. A limit component I is provided on the outside of the outer core shaft, and the outer core shaft is positioned and fed axially by the limit component I and the power mechanism II. The end head prepared by the roll forming device has excellent sealing performance and thermal insulation performance, and high rigidity, and can meet the requirements of advanced aircraft for its components.

Description

Technical Field

[0001] The present invention relates to the technical field of roll forming equipment, and in particular to a double-layer catheter end roll forming device and a use method thereof. Background Art

[0002] A large number of thin-walled aluminum alloy conduits are used in aviation fuel and environmental control piping systems. These conduits typically have large diameters and thin walls, and must meet the requirements of service under high-temperature and high-vibration conditions. Currently, fuel and environmental control piping systems typically use end-to-end rolling or welding technology to connect the conduit and sleeve, which can meet the requirements of current fighter jets. Future advanced aircraft in the aerospace field will have the characteristics of high maneuverability, high overload, and cross-space travel. Therefore, the onboard piping system must be able to operate normally under even more severe working conditions. The aluminum alloy conduits in fuel and environmental control systems have higher requirements for sealing, pressure resistance, thermal insulation, and rigidity, while also being lightweight and low-cost.

[0003] Common connection forming methods for large diameter aluminum alloy conduit ends are: end argon arc welding and internal rolling, but these two methods have the following problems:

[0004] 1) Using argon arc welding to weld the conduit and sleeve in an annular pattern, the weld is prone to defects such as porosity, inclusions, and incomplete penetration, requiring secondary or multiple welds. Furthermore, minor weld defects during the conduit's service life can lead to cracking of the conduit weld, potentially causing a serious aircraft accident.

[0005] 2) The heat generated by welding can cause deformation in thin-walled conduits and sleeves, requiring subsequent reshaping of the ends using specialized welding fixtures. This reshaping process requires extensive operator experience and high control of the reshaping force, making it very easy for the sleeves and conduits to be damaged or deformed. Furthermore, excessive tolerances on the length and axial angles of the conduit ends can lead to subsequent assembly problems.

[0006] 3) The internal rolling forming method of the end cap is suitable for thin-walled conduits. For thin-walled aluminum alloy conduits, the internal rolling forming method can only meet the use requirements of low-pressure systems and cannot further increase the working pressure of thin-walled aluminum alloy conduits;

[0007] 4) Thin-walled aluminum alloy conduits formed by internal rolling need to be covered with multiple layers of thermal insulation materials on the outer layer when serving in high-temperature and high-vibration areas. However, for pipes close to or directly connected to the engine, thin-walled aluminum tubes have poor thermal insulation and low rigidity.

[0008] In order to adapt to the working conditions of future advanced aircraft, a catheter end connection forming technology with good sealing performance, high pressure resistance, excellent thermal insulation performance and high rigidity is urgently needed to meet production needs. Summary of the Invention

[0009] The purpose of the present invention is to provide a double-layer catheter end rolling forming device and its use method. The prepared molded parts have excellent sealing and thermal insulation properties, high rigidity and can meet the requirements of advanced aircraft for their components.

[0010] The present invention is achieved through the following technical solutions:

[0011] A double-layer catheter end rolling forming device includes an inner retainer, an inner core shaft, an inner roller, an outer retainer, an outer roller, an outer core shaft, an inner core shaft clamping handle and a gear.

[0012] One end of the inner core shaft clamping handle is fixed to the inner core shaft by a locking member; the other end is used to connect to the power mechanism I, and the inner core shaft clamping handle and the inner core shaft form a rotating motion and axial feed motion component;

[0013] The inner retainer is used to accommodate the inner core shaft and part of the inner core shaft clamping handle. The inner retainer and the outer retainer are fixed at one end close to the inner core shaft clamping handle through the end connection cover and the locking assembly I; the inner retainer and the outer retainer at the other end are used to place the pipe sleeve and the double-layer catheter.

[0014] The end of the outer retainer away from the end connection cover contacts the outer core shaft through the outer roller, the outer core shaft is fixed with the gear assembly, the gear is connected to the power mechanism II, and a limit component I is provided on the outside of the outer core shaft. The outer core shaft is positioned and fed axially through the limit component I and the power mechanism II.

[0015] Furthermore, the limiting assembly I includes a rear thrust ball bearing, a rear double-layer wave spring retaining ring and an outer core shaft base, and the rear thrust ball bearing is used to support the rear end of the tooling.

[0016] Furthermore, the locking assembly I includes an outer retainer base, a front thrust ball bearing, a front double-layer wave spring retaining ring, a threaded sleeve, and a threaded sleeve screw.

[0017] Furthermore, the inner retainer is a cylindrical structure provided with an inner core shaft hole for installing the inner core shaft, and the inner retainer begins to have an inner roller groove for installing the inner roller. The inner retainer is provided with a threaded connection hole, and the end connection cover, the inner retainer and the outer retainer are connected and fixed by the end connection cover screw passing through the threaded connection hole.

[0018] Furthermore, five inner roller grooves are evenly arranged on the circumference of the inner retainer, and the cross-sectional shape of the inner roller grooves is trapezoidal.

[0019] Furthermore, the inner core shaft is a cylinder consisting of a connecting head, a cylindrical surface I, and a conical transmission surface. A conical screw groove is provided on the connecting head. The inner core shaft and the inner core shaft clamping handle are matched through the surface of the connecting head, and are fixed through the conical screw groove and the locking piece to form a component that can rotate and axially feed.

[0020] Furthermore, the tapered transmission surface and the inner roller have an angular relationship of α=2β, preferably: α=2°.

[0021] Furthermore, the inner roller is a conical rotating body consisting of a conical rolling surface I and a limiting end surface I. The angle between the axis of the inner roller installed in the inner roller groove and the axis of the inner core shaft is γ, γ=4°.

[0022] Furthermore, the outer retainer is a cylindrical body with an inner hole, and the outer retainer is provided with an outer roller groove for mounting an outer roller. The outer surface of the outer retainer is provided with an outer retainer thread, a screw hole I and a threaded sleeve positioning groove. The screw hole I connects the fixed end connection cover, the outer retainer and the inner retainer to form a rotating and feeding component as a whole; the threaded sleeve positioning groove is used to fix the relative position of the outer retainer and the threaded sleeve by the threaded sleeve screw.

[0023] Furthermore, seven outer roller grooves are evenly arranged on the circumference of the outer cage; the cross-sectional shape of the outer roller groove is trapezoidal.

[0024] Furthermore, two threaded sleeve positioning grooves are symmetrically provided on the outer retaining frame, and the screw hole I is provided on the threaded sleeve positioning groove.

[0025] Furthermore, the outer roller is a conical rotating body consisting of a conical rolling surface II and a limiting end surface II. The angle between the axis of the outer roller installed in the outer roller groove and the axis of the outer core shaft is γ, and γ=4°.

[0026] Furthermore, the outer core shaft comprises an outer retainer hole, a keyway I, a limiting boss I, an outer cylindrical surface I and an inner conical transmission surface, wherein the inner conical transmission surface has a gap with the outer roller after being assembled, the outer core shaft is connected to the gear via a keyway (6-2), and the outer retainer hole is used to install the outer retainer; the limiting boss I is combined with the rear thrust ball bearing, the rear double-layer wave spring retaining ring and the outer core shaft base to position the outer core shaft and feed it axially; the outer cylindrical surface I is the assembly surface of the gear and the rear thrust ball bearing; the outer core shaft drives the outer roller to rotate and radially compress the outer guide tube via the inner conical transmission surface.

[0027] Furthermore, the inner core shaft clamping handle includes a transmission connector, a limiting ring, an inner core shaft assembly hole, a conical screw hole and a cylindrical surface II. The transmission connector is connected to the power mechanism I, the limiting ring is used to limit the inner core shaft clamping handle, the inner core shaft assembly hole and the inner core shaft connector are assembled together, and a locking piece is used to pass through the conical screw hole to fix the inner core shaft and the inner core shaft clamping handle.

[0028] Furthermore, the outer retainer base includes an outer groove of the base, an outer cylindrical surface I of the base, an inner groove of the base, an inner hole of the base I and an inner limiting boss I. The outer retainer base is connected to the molding equipment through the outer groove of the base and the outer cylindrical surface I of the base. The front thrust ball bearing, the threaded sleeve and the outer retainer are assembled in the inner hole I of the base. The front thrust ball bearing is limited in the inner hole I of the base by the inner limiting boss I; the inner groove of the base is limited and fixed by the front double-layer wave spring retaining ring after the front thrust ball bearing, the threaded sleeve and the outer retainer are assembled.

[0029] Furthermore, the front thrust ball bearing and the rear thrust ball bearing each include a left bearing disc, a right bearing disc and balls.

[0030] Furthermore, the threaded sleeve is composed of an internal thread I, a limiting boss II, a contact end face, an outer cylindrical surface IV, and a screw hole II. The threaded sleeve is connected to the outer retainer through the internal thread I, and the threaded sleeve is screwed against the threaded sleeve positioning groove ( of the outer retainer through the screw hole II to achieve relative position adjustment and connection and fixation between the threaded sleeve and the outer retainer.

[0031] Furthermore, four screw holes II are evenly distributed on the threaded sleeve, which can achieve a minimum rotation adjustment of 1 / 4 turn.

[0032] Furthermore, the end connection cover includes an inner retainer assembly cylindrical surface, an inner core shaft clamping handle hole, an internal thread II and a screw hole III. The inner core shaft clamping handle hole and the cylindrical surface II in the inner core shaft clamping handle are clearance-fitted. The diameter of the limit ring is larger than the diameter of the inner core shaft clamping handle hole. The end connection cover is connected to the outer retainer through the internal thread II to form an assembly. The end connection cover is assembled with the inner retainer through the inner retainer assembly cylindrical surface to form an assembly. After completing the connection of the end connection cover, the inner retainer and the outer retainer, they are fixed by screws of the end connection cover to realize the linked rotation of the inner retainer and the outer retainer.

[0033] Furthermore, the outer core shaft base includes a base fixing boss, a base outer cylindrical surface II, a base inner hole I, and a limiting boss II in the retaining ring groove. The outer core shaft base is connected through the base fixing boss and the base outer cylindrical surface II; the rear thrust ball bearing and the outer core shaft are assembled in the base inner hole I; the retaining ring groove is used to place a double-layer wave spring retaining ring.

[0034] Furthermore, the locking member is a conical screw.

[0035] A method for using a double-layer catheter end roll forming device comprises the following steps:

[0036] S1: Install the double-layer catheter end rolling forming device of claim 1 on a forming device, wherein the outer retainer base is installed on the front support of the forming device, and the outer core shaft base is installed on the rear support of the forming device; the inner core shaft clamping handle is connected to the inner rolling motor of the forming device, and the gear is connected to the outer rolling motor of the forming device;

[0037] S2: Assembling the pipe sleeve and the double-layer conduit into a component to be roll-formed;

[0038] S3: Before forming, the assembly consisting of the inner cage, inner roller, outer cage, and outer roller needs to be adjusted to a suitable relative position with the sleeve. The sleeve and double-layered conduit are assembled into the assembly to be roll-formed and assembled into the double-layered conduit end roll-forming device. The appropriate position for the inner cage end face assembly is marked on the outer conduit of the double-layered conduit with a marker.

[0039] S4: placing the component to be roll-formed onto the equipment and fixing the outer conduit with a clamp;

[0040] S5: Install the front support plate and the rear support plate of the equipment, and close the equipment protective cover;

[0041] S6: After the roll forming parameter setting is completed, the roll forming automatically starts according to the set program: the inner core shaft clamping handle and the outer core shaft base both start axial feeding. When the torque values of the inner roll forming and the outer roll forming reach the set values at the same time, the inner core shaft clamping handle and the outer core shaft base stop axial feeding at the same time; then, the inner core shaft clamping handle and the gear are reversed at the same time, and the inner and outer tubes are rolled in opposite directions. After the inner core shaft clamping handle and the gear are reversed, the inner clamping handle and the outer core shaft base are retracted to the initial position before forming.

[0042] S7: After the inner core shaft clamping handle and the gear are reversed, the inner clamping handle and the outer core shaft base are simultaneously returned to the initial position before forming; the front support of the forming equipment drives the inner retainer and the outer retainer to return to the initial position before forming, the equipment protective cover is opened, the clamp fixing the outer catheter is removed, and the double-layer catheter formed by rolling the inner and outer ends is taken out.

[0043] Furthermore, in step S6, before the first end of each specification of double-layer catheter is rolled and formed, the front support of the forming equipment is controlled to move forward. At this time, the front support moves forward to a fixed position during forming. When the end face of the inner retainer does not coincide with the mark on the outer catheter, the relative position of the threaded sleeve and the outer retainer needs to be adjusted until the end face of the inner retainer coincides with the mark on the outer catheter.

[0044] Furthermore, the specific steps for adjusting the relative position of the threaded sleeve and the outer retainer are: first, unscrew the two symmetrically arranged threaded sleeve screws; fix the threaded sleeve and rotate the outer retainer clockwise / counterclockwise at the same time until the end face of the inner retainer coincides with the mark on the outer guide tube and the screw hole II coincides with the threaded sleeve positioning groove; finally, tighten the two threaded sleeve screws symmetrically.

[0045] Principle: The inner core shaft clamping handle and the outer core shaft base both start to feed axially, the inner core shaft clamping handle drives the inner core shaft to rotate and feed axially, the inner roller starts to rotate and expand outward, and the inner roller drives the inner retaining frame to rotate around the axis at the same time; the axial feed of the outer core shaft base and the rotation of the gear cause the outer roller to start to rotate and compress inward, and the outer roller drives the outer retaining frame to rotate around the axis at the same time; the inner retaining frame and the outer retaining frame are connected into a whole through the end connecting cover, so the inner roller and the outer roller drive the retaining frame to rotate together; after the torque values of the inner rolling forming and the outer rolling forming reach the set values at the same time, the inner core shaft clamping handle and the outer core shaft base stop axial feeding at the same time.

[0046] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0047] 1. In the present invention, the double-layered catheter formed by the double-layered catheter end rolling forming device of the present invention improves the sealing performance, pressure resistance, rigidity and thermal insulation performance of the formed catheter compared with the single-layered catheter internal rolling forming technology.

[0048] 2. In the present invention, the relative position of the retainer system composed of the inner retainer and the outer retainer and the outer retainer base is fine-tuned by thread. For pipe sleeves with the same inner and outer diameters and different groove positions, the position of the retainer can be flexibly adjusted, so that the forming device has the advantages of flexible adjustment and a wide range of applications.

[0049] 3. In the present invention, a double-layer catheter end rolling forming device and its use method adopt an internal and external rolling method to provide a reliable connection forming device for the double-layer catheter end. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] Figure 1 It is the main view of the overall structure of the present invention.

[0051] Figure 2 It is a cross-sectional view of the overall structure of the present invention.

[0052] Figure 3 It is an isometric view of the overall structure of the present invention.

[0053] Figure 4 Schematic diagram of the internal structure of the device of the present invention Figure 1 .

[0054] Figure 5 Schematic diagram of the internal structure of the device of the present invention Figure 2 .

[0055] Figure 6 Schematic diagram of the inner retainer structure of the present invention.

[0056] Figure 7 It is a schematic diagram of the inner core shaft structure of the present invention.

[0057] Figure 8 Schematic diagram of the inner roller structure of the present invention.

[0058] Figure 9 Schematic diagram of the outer retainer structure of the present invention.

[0059] Figure 10 It is a schematic diagram of the outer roller structure of the present invention.

[0060] Figure 11 It is a schematic diagram of the outer core shaft structure of the present invention.

[0061] Figure 12 It is a schematic structural diagram of the inner core shaft clamping handle of the present invention.

[0062] Figure 13 It is a schematic structural diagram of the tapered screw of the present invention.

[0063] Figure 14 Schematic diagram of the outer retainer base of the present invention.

[0064] Figure 15 It is a schematic diagram of the front thrust ball bearing of the present invention.

[0065] Figure 16 It is a schematic structural diagram of the front double-layer wave spring retaining ring of the present invention.

[0066] Figure 17 It is a structural schematic diagram of the threaded sleeve of the present invention.

[0067] Figure 18 It is a structural schematic diagram of the threaded sleeve screw of the present invention.

[0068] Figure 19 It is a schematic diagram of the end connection cover structure of the present invention.

[0069] Figure 20 This is a schematic diagram of the end connection cover screw structure of the present invention.

[0070] Figure 21 Schematic diagram of the gear structure of the present invention.

[0071] Figure 22 It is a schematic diagram of the flat key structure of the present invention.

[0072] Figure 23 It is a schematic structural diagram of the rear thrust ball bearing of the present invention.

[0073] Figure 24 It is a schematic structural diagram of the rear double-layer wave spring retaining ring of the present invention.

[0074] Figure 25 It is a schematic structural diagram of the outer core shaft base of the present invention.

[0075] Figure 26 It is a schematic diagram of the pipe sleeve structure of the present invention.

[0076] Figure 27 It is a schematic structural diagram of the double-layer conduit after roll forming of the present invention.

[0077] Figure 28 Schematic diagram of the angular relationship between the inner core shaft and the inner roller of the present invention.

[0078] Figure 29 Schematic diagram of the angular relationship between the outer core shaft and the outer roller of the present invention.

[0079] Among them: 1. Inner cage; 2. Inner core shaft; 3. Inner roller; 4. Outer cage; 5. Outer roller; 6. Outer core shaft; 7. Inner core shaft clamping handle; 8. Locking piece; 9. Outer cage base; 10. Front thrust ball bearing; 11. Front double-layer wave spring retaining ring; 12. Threaded sleeve; 13. Threaded sleeve screw; 14. End connection cover; 15. End connection cover screw; 16. Gear; 17. Flat key; 18. Rear thrust ball bearing; 19. Rear double-layer wave spring retaining ring; 20. Outer core shaft base; 21. Pipe sleeve; 22. Double-layer guide tube; 1-1. Inner core shaft hole; 1-2. Inner roller groove; 1-3. Threaded connection hole; 2-1. Connector; 2-2. Tapered screw groove; 2-3. Cylindrical surface I; 2-4. Tapered transmission surface; 3-1, tapered rolled surface I; 3-2, limiting end surface I; 4-1, inner hole; 4-2, outer roller groove; 4-3, outer cage thread; 4-4, screw hole I; 4-5, threaded sleeve positioning groove; 5-1, tapered rolled surface II; 5-2, limiting end surface II; 6-1, outer cage hole; 6-2, keyway I; 6-3, limiting boss I; 6-4, outer cylindrical surface I; 6-5, inner tapered transmission surface; 7-1, transmission connector; 7-2, limiting ring; 7-3, inner core shaft assembly hole; 7-4, tapered screw hole; 7-5, cylindrical surface II; 8-1, outer thread; 8-2, tapered surface; 8-3, inner hexagonal hole; 9-1, outer groove of base; 9-2, outer cylindrical surface I of base; 9-3, inner groove of base; 9-4 , base inner hole I; 9-5, inner limiting boss I; 10-1, left bearing plate I; 10-2, right bearing plate I; 10-3, ball I; 10-1-1, outer cylindrical surface II; 10-1-2, inner cylindrical surface I; 10-1-3, ball groove I; 10-1-4, end face I; 10-2-1, outer cylindrical surface III; 10-2-2, inner cylindrical surface II; 10-2-3, ball groove II; 10-2-4, end face II; 12-1, internal thread I; 12-2, limiting boss II; 12-3, contact end face; 12-4, outer cylindrical surface IV; 12-5, screw hole II; 13-1, thread I; 13-2, inner hexagonal groove I; 13-3, flat end face I; 14-1, inner retaining Frame assembly cylindrical surface; 14-2, inner mandrel clamping handle hole; 14-3, internal thread II; 14-4, screw hole III; 15-1, thread II; 15-2, inner hexagonal groove II; 15-3, flat end surface II; 16-1, tooth surface; 16-2, inner cylindrical surface III; 16-3, keyway II; 18-1, left bearing plate II; 18-2, right bearing plate II; 18-3, ball II; 18-1-1, outer cylindrical surface V; 18-1-2, inner cylindrical surface IV; 18-1-3, ball groove III; 18-1-4, end surface III; 18-2-1, outer cylindrical surface VI; 18-2-2, inner cylindrical surface V; 18-2-3, ball groove IV; 18-2-4, end surface IV;20-1, base fixing boss; 20-2, base outer cylindrical surface II; 20-3, base inner hole I; 20-4, retaining ring groove; 20-5, inner limiting boss II; 21-1, inner rolling groove; 21-2, outer rolling groove; 21-3, rubber ring groove; 21-4, clamp assembly groove; 21-5, inner conduit limiting boss; 21-6, outer conduit limiting boss; 22-1, inner conduit; 22-2, outer conduit; 22-1-1, outer cylindrical surface VII; 22-1-2, inner cylindrical surface VI; 22-1-3, end surface V; 22-2-1, outer cylindrical surface VIII; 22-2-2, inner cylindrical surface VII; 22-2-3, end surface VI. DETAILED DESCRIPTION

[0080] The present invention will be further described in detail below with reference to the examples, but the embodiments of the present invention are not limited thereto.

[0081] Example 1

[0082] This embodiment is the most basic implementation method, a double-layer catheter end roll forming device, which relates to the technical field of roll forming equipment, Figure 1-5 , including inner cage 1, inner core shaft 2, inner roller 3, outer cage 4, outer roller 5, outer core shaft 6, inner core shaft clamping handle 7 and gear 16,

[0083] One end of the inner core shaft clamping handle 7 is fixed to the inner core shaft 2 by a locking member 8; the other end is used to connect the power mechanism I, and the inner core shaft clamping handle 7 and the inner core shaft 2 form a rotating motion and axial feed motion component;

[0084] The inner retainer 1 is used to accommodate the inner core shaft 2 and part of the inner core shaft clamping handle 7. The inner retainer 1 and the outer retainer 4 are fixed at one end close to the inner core shaft clamping handle 7 through the end connection cover 14 and the locking assembly 1; the pipe sleeve 21 and the double-layer catheter 22 are placed between the inner retainer 1 and the outer retainer 4 at the other end.

[0085] The end of the outer retainer 4 away from the end connection cover 14 contacts the outer core shaft 6 through the outer roller 5, the outer core shaft 6 is assembled and fixed with the gear 16, the gear 16 is connected to the power mechanism II, and a limit component I is provided on the outside of the outer core shaft 6. The outer core shaft 6 is positioned and fed axially by the limit component I and the power mechanism II.

[0086] In this embodiment, the double-layer inner conduit 22 is composed of an inner conduit 22 - 1 and an outer conduit 22 - 2 .

[0087] Among them, the inner conduit 22-1 is composed of an outer cylindrical surface VII22-1-1, an inner cylindrical surface VI22-1-2, and an end surface V22-1-3. Figure 26The outer conduit is composed of an outer cylindrical surface VIII22-2-1, an inner cylindrical surface VII22-2-2, and an end surface VI22-2-3, reference Figure 27 When the equipment is working, it is necessary to ensure that the end surface V22-1-3 and the end surface VI22-2-3 are in the same plane.

[0088] When the outer roller 3 is in the state of rotation and the outer roller 3 is in the state of rotation, the outer roller 3 is in the state of rotation and the outer roller 3 is in the state of rotation. When the outer roller 3 is in the state of rotation and the outer roller 3 is in the state of rotation, the inner roller 3 is in the state of rotation and the outer roller 3 is in the state of rotation. When the outer roller 3 is in the state of rotation and the outer roller 3 is in the state of rotation, the inner roller 3 is in the state of rotation and the outer roller 3 is in the state of rotation.

[0089] Example 2

[0090] To facilitate the public's understanding of the present technical solution, this embodiment takes a certain type of double-layer catheter end rolling forming device as an example to further illustrate the present solution.

[0091] refer to Figure 1-5 As shown, the device described in the present invention consists of an inner retainer 1, an inner core shaft 2, an inner roller 3, an outer retainer 4, an outer roller 5, an outer core shaft 6, an inner core shaft clamping handle 7, a tapered screw 8, an outer retainer base 9, a front thrust ball bearing 10, a front double-layer wave spring retaining ring 11, a threaded sleeve 12, a threaded sleeve screw 13, an end connection cover 14, an end connection cover screw 15, a gear 16, a flat key 17, a rear thrust ball bearing 18, a rear double-layer wave spring retaining ring 19, an outer core shaft base 20, a pipe sleeve 21, and a double-layer guide tube 22.

[0092] like Figure 4 、 6As shown, the inner retainer 1 is a cylindrical body consisting of an inner core shaft hole 1-1, an inner roller groove 1-2, and a threaded connection hole 1-3; the cross-sectional shape of the inner roller groove 1-2 is a trapezoid, and the purpose of the trapezoidal design is to prevent the inner roller 3 from falling out of the inner roller groove 1-2 after the forming device is assembled. The inner core shaft 2 is installed in the inner core shaft hole 1-1, and 5 inner roller grooves 1-2 are evenly arranged on the circumference of the inner retainer 1. The inner roller 3 is installed in the inner roller groove 1-2. The purpose of the threaded connection hole 1-3 is to use the end connection cover screw 15 to connect the end connection cover 14, the inner retainer 1, and the outer retainer 4 into a component. As shown Figure 5 As shown, the inner and outer retainers 1 and 4 are connected together via end connection caps 14 and end connection cap screws 15. They advance and retract with the axial movement of the outer retainer support 9. During operation, the inner retainer 1 is driven to rotate about its axis by the non-coaxial rotation of the inner rollers 3. The roller-mounted end faces of the inner and outer retainers 1 and 4 are coplanar.

[0093] like Figure 7 As shown, the inner core shaft 2 is a cylindrical body consisting of a connector 2-1, a tapered screw groove 2-2, a cylindrical surface 12-3, and a tapered transmission surface 2-4. The inner core shaft 2 and the inner core shaft clamping handle 7 are assembled together through the profile of the connector 2-1 and fixed together through the tapered screw groove 2-2 and the locking member 8, forming a component that can rotate and axially feed. Figure 28 As shown, the tapered transmission surface 2-4 has an angle relationship with the inner roller 3, α=2β, preferably: α=2°. The locking member 8 is preferably a tapered screw.

[0094] As shown in FIG8 , the inner roller 3 is a conical rotating body composed of a conical rolling surface I3-1 and a limiting end surface I3-2. The inner roller 3 is installed in the inner roller groove 1-2 in the inner cage 1. Figure 28 As shown, after installation, the axes of the inner rollers 3 and the axis of the inner shaft 2 form a certain angle in both the horizontal and vertical planes. Preferably, five inner rollers 3 are evenly distributed, with γ = 4°. The rotation of the inner shaft 2 drives the inner rollers 3 to rotate about their own axes, which in turn drives the inner retainer 1 to rotate. Simultaneously, the axial advancement of the inner shaft 2 causes the inner rollers 3 to expand radially outward. The combined motions of driven rotation of the inner rollers 3, rotation about the inner shaft 2, and radial expansion form the inner tube 22-1 through internal rolling.

[0095] As shown in Figure 9, the outer retainer 4 is a cylindrical body consisting of an inner hole 4-1, an outer roller groove 4-2, an outer retainer thread 4-3, a screw hole 14-4, and a threaded sleeve positioning groove 4-5. The outer roller groove 4-2 has a trapezoidal cross-section. The trapezoidal shape is designed to prevent the outer roller 5 from falling out of the outer roller groove 4-2 after the forming device is assembled. The inner hole 4-1 is a space for installing the inner retainer 1, the inner core shaft 2, the inner roller 3, the inner core shaft clamping handle 7, the pipe sleeve 21, and the double-layer guide tube 22; the outer roller groove 4-2 is used to install the outer roller 5. Preferably, there are 7 outer rollers 5 evenly distributed. Figure 5 As shown, the outer retainer 4 is connected to the threaded sleeve 12 and the end connection cover 14 through the outer retainer thread 4-3, and is fixed together with the end connection cover screw 13 and the threaded sleeve screw 15; the function of the outer retainer thread 4-3 is to fine-tune the position of the component composed of the outer retainer 4 and the inner retainer 1 and the pipe sleeve 21, so as to ensure that the relative positions of the inner roller 3, the outer roller 5 and the pipe sleeve 21 are appropriate; the screw hole I4-4 connects and fixes the end connection cover 14, the outer retainer 4 and the inner retainer 1 to form a whole rotating and feeding component; the threaded sleeve positioning groove 4-5 is used to fix the relative position of the outer retainer 4 and the threaded sleeve 12 through the threaded sleeve screw 13, and preferably: two threaded sleeve positioning grooves 4-5 are symmetrically opened, and the screw hole I4-4 is opened on the threaded sleeve positioning groove 4-5.

[0096] As shown in Figure 10, the outer roller 5 is a conical rotating body consisting of a conical rolling surface II5-1 and a limiting end surface 5-2II. The outer roller 5 is installed in the outer roller groove 4-2 in the outer cage 4. After installation, the axis of the outer roller 5 forms a certain angle with the outer core shaft 6 in both the horizontal and vertical planes, as shown in FIG. Figure 29 As shown, the angle relationship is consistent with the angle between the inner roller 3 and the inner core shaft 2. Preferably, seven outer rollers 5 are evenly distributed. The rotation of the outer core shaft 6 drives the outer rollers 5 to rotate about their own axes, which in turn drives the outer retainer 4 to rotate. At the same time, the axial feed of the outer core shaft 6 causes the outer rollers 5 to compress radially inward. The three movements of the outer rollers 5's rotation, rotation about the outer core shaft 6, and radial compression constitute the outer roll-forming of the outer conduit 22-2.

[0097] like Figure 11As shown, the outer core shaft 6 is a cylindrical body consisting of an outer retainer hole 6-1, a keyway 16-2, a limiting boss 16-3, an outer cylindrical surface 16-4, and an inner tapered transmission surface 6-5. The inner tapered transmission surface 6-5 is angularly aligned with the outer roller 5. The outer core shaft 6 is assembled with the gear 16 and fixedly connected via the keyway 16-2. The outer retainer hole 6-1 provides mounting space for the outer retainer 4. The limiting boss 16-3, in conjunction with the rear thrust ball bearing 18, the rear double-layer wave spring retaining ring 19, and the outer core shaft base 20, positions and axially feeds the outer core shaft 6. The outer cylindrical surface 16-4 serves as the mounting surface for the gear 16 and the rear thrust ball bearing 18. The outer core shaft 6 drives the outer roller 5 to rotate and radially compresses the outer guide tube 22-2 via the inner tapered transmission surface 16.

[0098] like Figure 12 As shown, the inner core shaft clamping handle 7 is a cylindrical body consisting of a transmission connector 7-1, a limiting ring 7-2, an inner core shaft assembly hole 7-3, a tapered screw hole 7-4, and a cylindrical surface II7-5. The transmission connector 7-1 is connected to the motor of the forming equipment. After the connection, the inner core shaft clamping handle 7 can achieve axial feeding and forward and reverse rotation around the axis; the limiting ring 7-2 has a larger diameter than the core shaft hole 12-1 on the threaded sleeve 12. After the entire forming tool is assembled, the limiting ring 7-2 limits the inner core shaft clamping handle 7 to prevent the core shaft clamping handle 7 and the inner core shaft 2 from slipping during transportation; the inner core shaft assembly hole 7-3 is assembled with the connector 2-1 of the inner core shaft 2, and a locking member 8 such as a tapered screw is passed through the tapered screw hole 7-4 to fix the inner core shaft 2 and the inner core shaft clamping handle 7.

[0099] like Figure 13 As shown, the tapered screw 8 is composed of an external thread 8-1, a tapered surface 8-2, and an internal hexagonal hole 8-3. The function of the tapered screw 8 is to securely connect the inner core shaft 2 with the inner core shaft clamping handle 7, mainly by the cooperation between the tapered surface 8-2 and the tapered screw groove 2-2.

[0100] like Figure 14 As shown, the outer retainer base 9 is composed of a base outer groove 9-1, a base outer cylindrical surface I9-2, a base inner groove 9-3, a base inner hole I9-4, and an inner limiting boss I9-5. The outer retainer base 9 is assembled and connected to the equipment support via the base outer groove 9-1 and the base outer cylindrical surface I9-2. After the equipment upper pressure plate is installed, the forming device is fixed to the support. The front thrust ball bearing 10, threaded sleeve 12, and outer retainer 4 are assembled in the base inner hole I9-4. The front thrust ball bearing 10 is restrained in the base inner hole I9-4 by the inner limiting boss I9-5. After the front thrust ball bearing 10, threaded sleeve 12, and outer retainer 4 are assembled, the front double-layer wave spring retainer 11 is used to limit and secure the inner groove 9-3.

[0101] like Figure 15As shown, the front thrust ball bearing 10 comprises a left bearing disc 110-1, a right bearing disc 110-2, and a ball 110-3. The left bearing disc 110-1 comprises an outer cylindrical surface 110-1-1, an inner cylindrical surface 110-1-2, a ball groove 110-1-3, and an end surface 110-1-4. The outer cylindrical surface 110-1-1 has a clearance fit with the inner hole 19-4 of the outer retainer base 9, the inner cylindrical surface 110-1-2 has a clearance fit with the outer retainer 4, and the end surface 110-1-4 is in contact with the threaded sleeve 12. The right bearing disc I10-2 consists of an outer cylindrical surface III10-2-1, an inner cylindrical surface II10-2-2, a ball groove II10-2-3, and an end surface II10-2-4. The outer cylindrical surface III10-2-1 has an interference fit with the inner hole I9-4 of the outer retainer base 9, the inner cylindrical surface II10-2-2 has a clearance fit with the outer retainer 4, and the end surface II10-2-4 is in contact with the outer retainer base 9. During the forming process, the front thrust ball bearing 10 supports the front end of the tooling and ensures smooth relative rotation between the threaded sleeve 12 and the outer retainer base 9.

[0102] like Figure 5 、 16 As shown, the front double-layer wave spring retaining ring 11 is assembled in the base inner groove 9-3 of the outer retainer base 9. The function of the front double-layer wave spring retaining ring 11 is to limit the assembled front thrust ball bearing 10 and threaded sleeve 12 in the base inner hole I9-4.

[0103] like Figure 17 As shown, the threaded sleeve 12 is composed of an internal thread I12-1, a limiting boss 12-2II, a contact end face 12-3, an outer cylindrical surface IV12-4, and screw holes II12-5. The screw holes II12-5 are threaded. Preferably, four screw holes II12-5 are evenly distributed on the threaded sleeve 12, enabling a minimum rotation adjustment of 1 / 4 turn. The threaded sleeve 12 is connected to the outer retainer 4 via the internal thread I12-1. The threaded sleeve screw 13 is tightened against the threaded sleeve positioning groove 4-5 of the outer retainer 4 through the screw holes II12-5, adjusting the relative position of the threaded sleeve 12 and the outer retainer 4 and securing the connection. The end face III12-2-1 of the limiting boss II12-2 is assembled with the front double-layer wave spring retainer 11, which functions to fix the relative position of the outer retainer 4 and the outer retainer base 9. The contact end face 12-3 is assembled in contact with the end face I10-1-4 in the front thrust ball bearing 10, which can transmit the rotation of the outer retainer 4 to the front thrust ball bearing 10. At the same time, under the action of the ball I10-3, the left bearing disk 10-1 and the right bearing disk 10-2 form relative rotation.

[0104] like Figure 18As shown, the threaded sleeve screw 13 comprises a thread I13-1, a hexagonal recess I13-2, and a flat end surface I13-3. The threaded sleeve screw 13 secures the relative position of the threaded sleeve 12 and the outer retainer 4 by means of the threaded sleeve 12, the flat end surface I13-2, and the threaded sleeve positioning recess 4-5 on the outer retainer 4. Preferably, two threaded sleeve screws 13 are evenly spaced on the threaded sleeve 12.

[0105] like Figure 19 As shown, the end connection cover 14 is composed of an inner retainer assembly cylindrical surface 14-1, an inner core shaft clamping handle hole 14-2, an internal thread II 14-3, and a screw hole III 14-4. The inner core shaft clamping handle hole 14-2 is clearance-fitted with the cylindrical surface 7-4 of the inner core shaft clamping handle 7. The diameter of the retaining ring 7-2 is larger than the diameter of the inner core shaft clamping handle hole 14-2, ensuring that the inner core shaft clamping handle 7 will not slip off the end connection cover 14 after the tooling assembly is completed. The end connection cover 14 is connected to the outer retainer 4 via the internal thread II 14-3 to form an assembly. The end connection cover 14 is then assembled with the inner retainer 1 via the inner retainer assembly cylindrical surface 14-1. After the end connection cover 14, inner retainer 1, and outer retainer 4 are connected, they are fixed using the end connection cover screws 15, enabling the inner retainer 1 and outer retainer 4 to rotate in unison. Preferably, two screw holes III14 - 4 are opened symmetrically.

[0106] like Figure 20 As shown, the end cap screw 15 is composed of a thread II15-1, a hexagonal groove II15-2, and a flat end surface II15-3. The function of the end cap screw 15 is to fix the end cap 14, the inner retainer 1, and the outer retainer 4 into an assembly through the thread II15-1.

[0107] like Figure 21 As shown, gear 16 comprises a tooth surface 16-1, an inner cylindrical surface III 16-2, and a keyway II 16-3. The rotation of gear 16 is transmitted to the outer shaft 6 via tooth surface 16-1. The inner cylindrical surface III 16-2 forms an interference fit with the outer cylindrical surface I 6-4 of the outer shaft 6, while a flat key 17 fits into the keyway II 16-3, forming an assembly of gear 16 and the outer shaft 6.

[0108] like Figure 22 As shown, the flat key 17 is a common rectangular flat key.

[0109] like Figure 23As shown, the rear thrust ball bearing 18 is composed of a left bearing disc II18-1, a right bearing disc II18-2, and a ball II18-3. The left bearing disc II18-1 comprises an outer cylindrical surface V18-1-1, an inner cylindrical surface IV18-1-2, a ball groove III18-1-3, and an end surface III18-1-4. The inner cylindrical surface IV18-1-2 forms a clearance fit with the outer cylindrical surface I6-4 on the outer core shaft 6, while the end surface III18-1-4 mates with the limiting boss I6-3. The outer cylindrical surface V18-1-1 forms a transition fit with the outer core shaft base 20. The right bearing disc II18-2 consists of an outer cylindrical surface VI18-2-1, an inner cylindrical surface V18-2-2, a ball groove IV18-2-3, and an end surface IV18-2-4. The outer cylindrical surface VI18-2-1 forms an interference fit with the outer cylindrical surface II20-2 of the outer core shaft base 20. The inner cylindrical surface V18-2-2 forms a clearance fit with the outer cylindrical surface I6-4 of the outer core shaft 6. The end surface IV18-2-4 is fitted snugly with the double-layer wave spring retaining ring 19. The rear thrust ball bearing 18 supports the rear end of the tooling during the forming process, ensuring smooth relative rotation between the outer core shaft 6 and the outer core shaft base 20.

[0110] like Figure 2 、 24 As shown, the rear double-layer wave spring retaining ring 19 is assembled in the retaining ring groove 20-4 of the outer core shaft base 20. The function of the rear double-layer wave spring retaining ring 19 is to limit the assembled rear thrust ball bearing 18 in the base inner hole II20-3.

[0111] like Figure 25 As shown, the outer core shaft base 20 comprises a base fixing boss 20-1, a base outer cylindrical surface II20-2, a base inner bore II20-3, a retaining ring groove 20-4, and an inner limiting boss II20-5. The outer core shaft base 20 is assembled and connected to the equipment support via the base fixing boss 20-1 and the base outer cylindrical surface II20-2. The thrust ball bearing 18 and the outer core shaft 6 are assembled into the base inner bore II20-3. The retaining ring groove 20-4 is used to limit and secure the thrust ball bearing 18 and the outer core shaft 6 after assembly.

[0112] like Figure 26As shown, the sleeve 21 is composed of an inner rolled groove 21-1, an outer rolled groove 21-2, a rubber ring groove 21-3, a clamp assembly groove 21-4, an inner conduit limiting boss 21-5, and an outer conduit limiting boss 21-6. Before roll forming, the double-layer conduit 22 is assembled in the sleeve 21. The outer cylindrical surface VII22-1-1 of the inner conduit 22-1 has a clearance fit with the inner rolled groove 21-1, and the end surface V22-1-3 is in contact with the inner conduit limiting boss 21-5. The inner cylindrical surface VII22-2-2 of the outer conduit 22-2 has a clearance fit with the outer rolled groove 21-2, and the end surface VI22-2-3 is in contact with the outer conduit limiting boss 21-6. During the forming process, the inner cylindrical surface VI22-1-2 of the inner conduit 22-1 is subjected to radial expansion rolling force by the inner roller 3; the outer cylindrical surface VIII22-2-1 of the outer conduit 22-2 is subjected to radial compression rolling force by the outer roller 5. Preferably, the gap between the inner and outer conduits 22-1, 22-2, and the sleeve 21 is 0.1 mm; the number of inner and outer rolling grooves 21-1, 21-2 is six, and the inner and outer rolling grooves 21-1, 21-2 are aligned.

[0113] like Figure 27 As shown, the double-layer inner conduit 22 is composed of an inner conduit 22-1 and an outer conduit 22-2. The inner conduit 22-1 is formed by an outer cylindrical surface VII22-1-1, an inner cylindrical surface VI22-1-2, and an end surface V22-1-3. The outer conduit is formed by an outer cylindrical surface VIII22-2-1, an inner cylindrical surface VII22-2-2, and an end surface VI22-2-3. End surfaces V22-1-3 and VI22-2-3 are coplanar. After the double-layer conduit is roll-formed, the inner and outer conduits 22-1 and 22-2 respectively fill the inner and outer roll-formed grooves 21-1 and 21-2 of the sleeve 21.

[0114] The method of use comprises the following steps:

[0115] Step S1: Install the double-layer catheter roll forming device on the forming equipment, install the outer retainer base 9 on the front support of the equipment, and install the outer core shaft base 20 on the rear support of the equipment; connect the inner core shaft clamping handle 7 to the inner rolling motor of the equipment, and connect the gear 16 to the outer rolling motor of the equipment;

[0116] Step S2: Assemble the pipe sleeve 21 and the double-layered conduit 22 into a component to be roll-formed;

[0117] Step S3: Before forming, the assembly consisting of the inner retainer 1, inner roller 2, outer retainer 4, and outer roller 5 needs to be adjusted to the appropriate relative position to the sleeve 21. The sleeve 21 and double-layered conduit 22 are assembled into the assembly to be roll-formed and then assembled into the double-layered conduit roll-forming apparatus. The appropriate position for the end face of the inner retainer 1 to be assembled is marked on the outer conduit 22-2 with a marker.

[0118] Step S4: placing the component to be roll-formed onto the equipment and fixing the outer conduit 22 - 2 with a clamp;

[0119] Step S5: Before the first end roll forming of each specification of double-layer conduit, the front support of the control equipment is moved forward. At this time, the front support moves forward to the fixed position during forming. The end face of the inner retainer 1 and the mark on the outer conduit 22-2 do not coincide with each other. The relative position of the threaded sleeve 12 and the outer retainer 4 needs to be adjusted until the end face of the inner retainer 1 coincides with the mark on the outer conduit 22-2.

[0120] Step S6: Adjust the relative position of the threaded sleeve 12 and the outer retainer 4. The specific steps are as follows: first, unscrew the two symmetrically arranged threaded sleeve screws 13; fix the threaded sleeve 12 and simultaneously rotate the outer retainer 4 clockwise / counterclockwise until the end face of the inner retainer 1 coincides with the mark on the outer guide tube 22-2 and the screw hole II12-5 coincides with the threaded sleeve positioning groove 4-5; finally, symmetrically tighten the two threaded sleeve screws 13;

[0121] Step S7: Install the front support plate and the rear support plate of the equipment, and close the equipment protective cover;

[0122] Step S8: After the roll forming parameters are set, the roll forming automatically starts according to the set program;

[0123] Step S9: The inner core shaft clamping handle 7 and the outer core shaft base 20 both start axial feeding, the inner core shaft clamping handle 7 drives the inner core shaft 2 to rotate and axially feed, the inner roller 3 starts to rotate and expand outward, and the inner roller 3 drives the inner retainer 1 to rotate around the axis; the axial feeding of the outer core shaft base 20 and the rotation of the gear 16 cause the outer roller 5 to start to rotate and compress inward, and the outer roller 5 drives the outer retainer 4 to rotate around the axis; the inner retainer 1 and the outer retainer 4 are connected into a whole through the end connection cover 14, so the inner roller 3 and the outer roller 5 jointly drive the retainer to rotate; after the torque values of the inner rolling forming and the outer rolling forming reach the set values at the same time, the inner core shaft clamping handle 7 and the outer core shaft base 20 stop axial feeding at the same time;

[0124] Step S10: After the inner core shaft clamping handle 7 and the core shaft base 20 stop axial feeding at the same time, the inner core shaft clamping handle 7 and the gear 16 are reversed at the same time to roll the inner guide tube 22-1 and the outer guide tube 22-2 in opposite directions;

[0125] Step S11: After the inner core shaft clamping handle 7 and the gear 16 are rotated in reverse, the inner core shaft clamping handle 7 and the outer core shaft base 20 are simultaneously retracted to their initial positions before forming;

[0126] Step S12: The front support of the equipment drives the inner retainer 1 and the outer retainer 4 to retract to the initial position before forming;

[0127] Step S13: Open the equipment protective cover, remove the clamp that fixes the outer catheter, and take out the double-layer catheter formed by rolling the inner and outer ends. Figure 27 shown.

[0128] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Any simple modification or equivalent change made to the above embodiment based on the technical essence of the present invention shall fall within the scope of protection of the present invention.

Claims

1. A double-layer catheter end rolling forming device, characterized in that: It includes an inner cage (1), an inner core shaft (2), an inner roller (3), an outer cage (4), an outer roller (5), an outer core shaft (6), an inner core shaft clamping handle (7) and a gear (16). One end of the inner core shaft clamping handle (7) is fixed to the inner core shaft (2) through a locking member (8); the other end is used to connect to the power mechanism I, and the inner core shaft clamping handle (7) and the inner core shaft (2) form a rotating motion and axial feed motion component; The inner retainer (1) is used to accommodate the inner core shaft (2) and part of the inner core shaft clamping handle (7), and the inner retainer (1) and the outer retainer (4) are fixed at one end close to the inner core shaft clamping handle (7) through the end connection cover (14) and the locking assembly I; the inner retainer (1) and the outer retainer (4) at the other end are used to place the pipe sleeve (21) and the double-layer catheter (22). The end of the outer retainer (4) away from the end connection cover (14) contacts the outer core shaft (6) through the outer roller (5), the outer core shaft (6) is fixedly assembled with the gear (16), the gear (16) is connected to the power mechanism II, and a limit assembly I is provided on the outside of the outer core shaft (6), and the outer core shaft (6) is positioned and fed in the axial direction through the limit assembly I and the power mechanism II; The inner retainer (1) is a cylindrical structure provided with an inner core shaft hole (1-1) for mounting an inner core shaft (2); an inner roller groove (1-2) for mounting an inner roller (3) is provided on the inner retainer (1); a threaded connection hole (1-3) is provided on the inner retainer (1); and an end connection cover screw (15) passes through the threaded connection hole (1-3) to connect and fix the end connection cover (14), the inner retainer (1) and the outer retainer (4); The outer retainer (4) is a cylindrical body provided with an inner hole (4-1); the outer retainer (4) is provided with an outer roller groove (4-2) for mounting an outer roller (5); the outer surface of the outer retainer (4) is provided with an outer retainer thread (4-3), a screw hole I (4-4) and a threaded sleeve positioning groove (4-5); the screw hole I (4-4) is connected to the fixed end connection cover (14), the outer retainer (4) and the inner retainer (1) to form a rotating and feeding component as a whole; the threaded sleeve positioning groove (4-5) fixes the relative position of the outer retainer (4) and the threaded sleeve (12) through the threaded sleeve screw (13).

2. The double-layer catheter end rolling forming device according to claim 1, characterized in that: The limiting assembly I comprises a rear thrust ball bearing (18), a rear double-layer wave spring retaining ring (19) and an outer core shaft base (20), wherein the rear thrust ball bearing (18) is used to support the rear end of the forming device.

3. The double-layer catheter end rolling forming device according to claim 1, characterized in that: The locking assembly I comprises an outer retainer base (9), a front thrust ball bearing (10), a front double-layer wave spring retaining ring (11), a threaded sleeve (12), and a threaded sleeve screw (13).

4. The double-layer catheter end rolling forming device according to claim 1, characterized in that: Five inner roller grooves (1-2) are evenly arranged on the circumference of the inner retainer (1), and the cross-sectional shape of the inner roller grooves (1-2) is trapezoidal.

5. The double-layer catheter end rolling forming device according to claim 1, characterized in that: The inner core shaft (2) is a cylindrical body consisting of a connector (2-1), a cylindrical surface I (2-3), and a conical transmission surface (2-4). A conical screw groove (2-2) is provided on the connector (2-1). The inner core shaft (2) and the inner core shaft clamping handle (7) are matched with each other through the surface of the connector (2-1) and are fixed by the conical screw groove (2-2) and the locking member (8) to form a component capable of rotational movement and axial feed movement.

6. The double-layer catheter end rolling forming device according to claim 5, characterized in that: The tapered transmission surface (2-4) and the inner roller (3) have an angular relationship of α=2β, α=2°.

7. The double-layer catheter end rolling forming device according to claim 1, characterized in that: The inner roller (3) is composed of a conical rolling surface I (3-1) and a limiting end surface I (3-2) to form a conical rotating body. The angle between the axis of the inner roller (3) installed in the inner roller groove (1-2) and the axis of the inner core shaft (2) is γ, and γ=4°.

8. The double-layer catheter end rolling forming device according to claim 1, characterized in that: Seven outer roller grooves (4-2) are evenly arranged in the circumferential direction of the outer retainer (4); the cross-sectional shape of the outer roller grooves (4-2) is trapezoidal.

9. The double-layer catheter end rolling forming device according to claim 1, characterized in that: Two threaded sleeve positioning grooves (4-5) are symmetrically provided on the outer retaining frame (4), and the screw hole I (4-4) is provided on the threaded sleeve positioning groove (4-5).

10. The double-layer catheter end rolling forming device according to claim 1, characterized in that: The outer roller (5) is a conical rotating body consisting of a conical rolling surface II (5-1) and a limiting end surface II (5-2). The angle between the axis of the outer roller (5) installed in the outer roller groove (4-2) and the axis of the outer core shaft (6) is γ, and γ=4°.

11. The double-layer catheter end rolling forming device according to claim 1, characterized in that: The outer core shaft (6) comprises an outer retainer hole (6-1), a keyway I (6-2), a limiting boss I (6-3), an outer cylindrical surface I (6-4) and an inner conical transmission surface (6-5), wherein the inner conical transmission surface (6-5) has a gap after being assembled with the outer roller (5), and the outer core shaft (6) is connected to the gear (16) through the keyway I (6-2), and the outer retainer hole (6-1) is used to install the outer retainer (4); the limiting boss I (6-3) is combined with the rear thrust ball bearing (18), the rear double-layer wave spring retaining ring (19) and the outer core shaft base (20) to position the outer core shaft (6) and feed it axially; the outer cylindrical surface I (6-4) is the assembly surface of the gear (16) and the rear thrust ball bearing (18); the outer core shaft (6) drives the outer roller (5) to rotate and radially compress the outer guide tube (22-2) through the inner conical transmission surface (6-5).

12. The double-layer catheter end rolling forming device according to claim 1, characterized in that: The inner core shaft clamping handle (7) comprises a transmission connector (7-1), a limiting ring (7-2), an inner core shaft assembly hole (7-3), a tapered screw hole (7-4) and a cylindrical surface II (7-5). The transmission connector (7-1) is connected to the power mechanism I. The limiting ring (7-2) is used to limit the inner core shaft clamping handle (7). The inner core shaft assembly hole (7-3) is assembled with the connector (2-1) of the inner core shaft (2). A locking member (8) is passed through the tapered screw hole (7-4) to fix the inner core shaft (2) and the inner core shaft clamping handle (7).

13. The double-layer catheter end rolling forming device according to claim 3, characterized in that: The outer retainer base (9) comprises an outer base groove (9-1), an outer base cylindrical surface I (9-2), an inner base groove (9-3), an inner base hole I (9-4) and an inner limiting boss I (9-5). The outer retainer base (9) is connected to the molding equipment via the outer base groove (9-1) and the outer base cylindrical surface I (9-2). The front thrust ball bearing (10), the threaded sleeve (12) and the outer retainer (4) are assembled in the inner base hole I (9-4). The front thrust ball bearing (10) is limited in the inner base hole I (9-4) by the inner limiting boss I (9-5). The inner base groove (9-3) is limited and fixed by the front double-layer wave spring retaining ring (11) after the front thrust ball bearing (10), the threaded sleeve (12) and the outer retainer (4) are assembled.

14. The double-layer catheter end rolling forming device according to claim 3, characterized in that: The threaded sleeve (12) is composed of an internal thread I (12-1), a limiting boss II (12-2), a contact end face (12-3), an outer cylindrical surface IV (12-4), and a screw hole II (12-5). The threaded sleeve (12) is connected to the outer retainer (4) through the internal thread I (12-1), and the threaded sleeve screw (13) is tightened against the threaded sleeve positioning groove (4-5) of the outer retainer (4) through the screw hole II (12-5), thereby achieving relative position adjustment and connection and fixation between the threaded sleeve (12) and the outer retainer (4).

15. The double-layer catheter end rolling forming device according to claim 14, characterized in that: Four screw holes II (12-5) are evenly distributed on the threaded sleeve (12), and can achieve a minimum rotation adjustment of 1 / 4 turn.

16. The double-layer catheter end rolling forming device according to claim 1, characterized in that: The end connection cover (14) includes an inner retainer assembly cylindrical surface (14-1), an inner core shaft clamping handle hole (14-2), an internal thread II (14-3) and a screw hole III (14-4). The inner core shaft clamping handle hole (14-2) and the cylindrical surface II (7-5) in the inner core shaft clamping handle (7) are clearance-matched. The diameter of the limit ring (7-2) is larger than the diameter of the inner core shaft clamping handle hole (14-2). The end connection cover (14) is connected to the outer retainer (4) through the internal thread II (14-3) to form an assembly. The end connection cover (14) is assembled with the inner retainer (1) through the inner retainer assembly cylindrical surface (14-1) to form an assembly. After the end connection cover (14), the inner retainer (1) and the outer retainer (4) are connected, they are fixed by the end connection cover screws (15) to achieve the linked rotation of the inner retainer (1) and the outer retainer (4).

17. The double-layer catheter end rolling forming device according to claim 13, characterized in that: The outer core shaft base (20) comprises a base fixing boss (20-1), a base outer cylindrical surface II (20-2), a base inner hole II (20-3), a retaining ring groove (20-4) and an inner limit boss II (20-5), wherein the outer core shaft base (20) is connected via the base fixing boss (20-1) and the base outer cylindrical surface II (20-2); a rear thrust ball bearing (18) and an outer core shaft (6) are assembled in the base inner hole II (20-3); and the retaining ring groove (20-4) is used for accommodating a double-layer wave spring retaining ring (19).

18. The double-layer catheter end rolling forming device according to claim 17, characterized in that: The front thrust ball bearing (10) and the rear thrust ball bearing (18) both comprise a left bearing disc, a right bearing disc and balls.

19. A double-layer catheter end rolling forming device according to any one of claims 1, 5, and 12, characterized in that: The locking member (8) is a conical screw.

20. A method for using a double-layer catheter end rolling forming device, characterized in that: The steps include: S1: The double-layer catheter end rolling forming device of claim 1 is installed on the forming equipment, the outer retainer base (9) is installed on the front support of the forming equipment, and the outer core shaft base (20) is installed on the rear support of the forming equipment; the inner core shaft clamping handle (7) is connected to the inner rolling motor of the forming equipment, and the gear (16) is connected to the outer rolling motor of the forming equipment; S2: Assembling the pipe sleeve (21) and the double-layered conduit (22) into a component to be roll-formed; S3: Before forming, the position of the assembly consisting of the inner retainer (1), the inner roller (3), the outer retainer (4), and the outer roller (5) needs to be adjusted to a suitable relative position with the tube sleeve (21), and the assembly to be rolled and formed by assembling the tube sleeve (21) and the double-layered catheter (22) is assembled into a double-layered catheter end rolling forming device, and the suitable position for the end face assembly of the inner retainer (1) is marked on the outer catheter (22-2) of the double-layered catheter (22) with a marker pen; S4: placing the component to be roll-formed onto the device and fixing the outer conduit (22-2) with a clamp; S5: Install the front support plate and the rear support plate of the equipment, and close the equipment protective cover; S6: After the roll forming parameter setting is completed, the roll forming automatically starts according to the set program: the inner core shaft clamping handle (7) and the outer core shaft base (20) both start axial feeding. When the torque values of the inner roll forming and the outer roll forming reach the set values at the same time, the inner core shaft clamping handle (7) and the outer core shaft base (20) stop axial feeding at the same time; then, the inner core shaft clamping handle (7) and the gear (16) are reversed at the same time, and the inner guide tube (22-1) and the outer guide tube (22-2) are rolled in the opposite direction. After the inner core shaft clamping handle (7) and the gear (16) are reversed, the inner clamping handle (7) and the outer core shaft base (20) are simultaneously retracted to the initial position before forming; S7: The front support of the forming equipment drives the inner retainer (1) and the outer retainer (4) to retract to the initial position before forming, the equipment protective cover is opened, the clamp fixing the outer catheter is removed, and the double-layer catheter formed by rolling the inner and outer ends is taken out.

21. The method for using the double-layer catheter end roll forming device according to claim 20, characterized in that: In step S6, before the first end of each specification of the double-layer catheter is rolled and formed, the front support of the forming equipment is controlled to move forward. At this time, the front support moves forward to a fixed position during forming. When the end face of the inner retainer (1) does not coincide with the mark on the outer catheter (22-2), the relative position of the threaded sleeve (12) and the outer retainer (4) needs to be adjusted until the end face of the inner retainer (1) coincides with the mark on the outer catheter (22-2).

22. The method for using the double-layer catheter end rolling forming device according to claim 21, characterized in that: The specific steps for adjusting the relative position of the threaded sleeve (12) and the outer retainer (4) are as follows: first, unscrew the two symmetrically arranged threaded sleeve screws (13); fix the threaded sleeve (12) and simultaneously rotate the outer retainer (4) clockwise / counterclockwise until the end face of the inner retainer (1) coincides with the mark on the outer guide tube (22-2) and the screw hole II (12-5) coincides with the threaded sleeve positioning groove (4-5); finally, symmetrically tighten the two threaded sleeve screws (13).

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